According to, the human body grows steadily from birth to late teens, at which point the skeletal system has fully formed. However, a few studies have found that both the pelvis and skull continue to grow a... More »

Boys usually stop growing at around the age of 16, while girls often stop between 14 and 15 years old. The exact time when people stop growing varies, however, and muscles may continue to grow even after a person stops g... More » Science Human Anatomy

The human head becomes formed by the late teens or early 20s. It grows steadily from birth, along with the rest of the bones in the body, until the development of the skeletal structure is complete. However, the shape of... More »

The body parts are grouped into several systems, including the nervous system of the brain, spinal cord and nerves that control the body, its muscles and glands; and the skeletal system of the bones and joints that suppo... More »

Vitamin B3 affects the human body in a number of ways, including lowering bad cholesterol, supporting the nervous system and assisting the body in converting food into energy. Vitamin B3 is also essential for healthy hai... More » Health Medications & Vitamins Vitamins & Supplements

According to the Library of Congress, the human body has at least 650 skeletal muscles and as many as 840 depending on what counts as a muscle. Some sources count complex muscles as a single muscle, while others count co... More »

Hot weather and heavy physical activity cause the human body to overheat, according to Health Central. Dehydration, sleep deprivation and illicit drugs, such as amphetamines and ecstasy, can overwhelm the body and affect... More »